here is the entry:
INFO: invalid entry CRC (expected 0x66be1b3 but got 0x56755ba6)
SEVERE: oracle.sysman.oii.oiif.oiifb.OiifbEndIterateException: invalid entry CRC (expected 0x66be1b3 but got 0x56755ba6)
at oracle.sysman.oii.oiic.OiicInstallAPISession.doOperation(OiicInstallAPISession.java:453)
at oracle.sysman.oii.oiic.OiicAPIInstaller.doOperation(OiicAPIInstaller.java:973)
at oracle.sysman.oii.oiic.OiicAPIInstaller.doOperation(OiicAPIInstaller.java:936)
at oracle.install.driver.oui.OUISetupDriver.setup(OUISetupDriver.java:456)
at oracle.install.driver.oui.SetupJob.call(SetupJob.java:166)
at oracle.install.driver.oui.SetupJob.call(SetupJob.java:47)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)

This seems to be a fairly consistent problem. I have downloaded the 64 Bit Windows OBIEE 4 times now and still get this error during install.
Installation Failed. OUI Session failed invalid entry CRC (expected 0xb6ebb2e6 but got 0x8d947f3f)
Along with filegroup1, filegroup2 .jar corrupt. Get 25% through install and get the above.